It's not theft though is it - you can't steal something which is infinitely reproducible. Theft - by current definition means you have to deprive someone of the ability to sell a product or service. In the case of downloading ebooks - this is copyright infringement, there is no denial of products/services to sell - only a potential loss in the form of the downloader.
It's as if the legal definition of theft had been created before anyone knew about the internet and the ability to copy things without the use of materials in the "real world".
Can I suggest that, while "copyright infringement" may seem, to you, to be a more accurate term for what is happening in a technical sense, it is, in reality, no more than a euphemism for taking something without the consent of the owner. (I'm reminded -- at the risk of mentioning something that might have been in our old World Affairs sub-forum -- of the recent headline**, "Gosport hospital deaths: Prescribed painkillers 'shortened 456 lives'," when what had happened was that those 456 had been killed. After all, what are murders, or even massacres, if they are not the shortening of the victims' lives.
Lack of consent lies at the heart of many crimes. It's what differentiates the proceeds of stealing from gifts. It's the crucial difference in some of the most serious crimes we have. We even have laws that state that certain people (due to age or mental infirmity) are not able to give consent to what is happening to them, so that even if they agree to something, the person doing that something is committing a criminal offence.
Pirating a book is doing something without the copyright owner's consent. That the person reading the pirated copy may not have bought the book if that was the only way of obtaining it is neither here nor there. They have done something that required consent and they have not recieved that consent. (After all, a thief does not have to come away from the scene of their crime with anything in order to have committed that crime. And it can still be attempted murder if no-one has had so much as a hair on their head damaged.)
It seems to me that, whatever the law says, we should use the words that are appropriate to what is happening... in this case taking something without permission, which is, in common parlance, theft. If nothing else, we should do this
because "younger generations really don't view the internet in the same way as older generations". Isn't it the duty of us older generations to point out the reality of what is being done, rather than sugar coat it into benignity?
** - Yes, that is an actual headline.